SPRINGFIELD, Ohio (AP) — The Clark County Sheriff's Office says a woman was found dead after falling off a boat in a reservoir at western Ohio's Buck Creek State Park.

Dayton media outlets report the death Monday night is a suspected drowning, but an autopsy was expected.

It's not clear why the woman fell overboard at the reservoir near Springfield. Authorities said they don't believe alcohol was a factor, and the circumstances are under investigation.

They say the woman's husband called 911 seeking help, but the cellphone reception was sporadic and authorities lost contact with him. A bystander with a boat helped deputies and state troopers locate the woman's husband, who was sending up flares. A dive team then helped recover the woman's body.